Rename OCE_TCL_TEST_LIST option into OCE_TCL_TEST_GROUP
Rename OCE_TCL_TEST_LIST option into OCE_TCL_TEST_GROUP

Running several testgrid commands in the same draw script does
not work, results are not concatenated.  So let user choose only
one single group.

Tridify/oce,finetjul/oce,tpaviot/oce,EvgeneOskin/oce,heartvalve/oce,tpaviot/oce,finetjul/oce,Tridify/oce,Tech-XCorp/oce,mathstuf/oce,mathstuf/oce,Tech-XCorp/oce,Tridify/oce,tpaviot/oce,finetjul/oce,Tech-XCorp/oce,BenoitPerrot/oce,Tech-XCorp/oce,finetjul/oce,BenoitPerrot/oce,EvgeneOskin/oce,Tridify/oce,tpaviot/oce,BenoitPerrot/oce,heartvalve/oce,EvgeneOskin/oce,BenoitPerrot/oce,heartvalve/oce,heartvalve/oce,EvgeneOskin/oce,mathstuf/oce,heartvalve/oce,mathstuf/oce,Tridify/oce,EvgeneOskin/oce,mathstuf/oce,finetjul/oce,BenoitPerrot/oce,Tech-XCorp/oce,tpaviot/oce